<template>
  <van-tabbar v-model="value" active-color="#ee0a24" inactive-color="#000" route>
    <van-tabbar-item to="/home" icon="home-o">首页</van-tabbar-item>  
    <van-tabbar-item to="/topic" icon="label-o">专题</van-tabbar-item>
    <van-tabbar-item to="/category" icon="apps-o">分类</van-tabbar-item>
    <van-tabbar-item to="/cart" icon="cart-o" >购物车</van-tabbar-item>
    <van-tabbar-item to="/user" icon="user-o">我的</van-tabbar-item>
  </van-tabbar>
</template>

<script>

export default {
  data() {
    return {
      value:0
    }
  }, 
  mounted(){
    this.$bus.$on("modify",(value)=>{
      
      this.value = value;

    })
  }
};
</script>
更改
<style>
</style>